I find those that are listed with Reserves don't tend to meet them, especially when they are set relatively high, like near the top end of what you really want. Keep an eye on those listings which gain a lot of attention and try and emulate their ads. Especially when they get top dollar. That will give you a good idea about how much you could realistically expect.
Be open and honest about any scuffs, marks etc. and get some good pics of it too.
And don't let anyone take the mick out of you for being a zero (ebay rating). Some will try and make you silly offers outside of eBay. Let the listing run it's course
Oh and make sure you're selling something people want.
What is the handset BTW?

I find those that are listed with Reserves don't tend to meet them, especially when they are set relatively high, like near the top end of what you really want. Keep an eye on those listings which gain a lot of attention and try and emulate their ads. Especially when they get top dollar. That will give you a good idea about how much you could realistically expect.
Be open and honest about any scuffs, marks etc. and get some good pics of it too.
And don't let anyone take the mick out of you for being a zero (ebay rating). Some will try and make you silly offers outside of eBay. Let the listing run it's course
Oh and make sure you're selling something people want.
What is the handset BTW?

Make sure to specify that you will only ship phone within UK (and EU if interested). If you manage to figure out how to block bidders from outside UK - do it. There will be people from around the world trying to bid and tie you up into some scam payment scheme.
If phone is expensive add shipping charges to auction and plan to ship via certified mail with tracking number. It's always nice to have a peace of mind that it will be delivered (and not lost or claimed as lost).